UPDATE:The indictments say the former aides also face charges of child abuse. They have both been released on bond.

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Two former teacher aides at Powell Middle School face charges of official oppression after a grand jury handed down indictments Wednesday, according to the Knox County Sheriff's Office.

Robin Hunter, 53, and Chaunta Underwood, 44, were arrested about 11 a.m. Wednesday, the KCSO announced in a Facebook post.

"Hunter and Underwood were teacher aides at Powell Middle School when the incident that led to the arrests occurred," the post reads.

However, the sheriff's office offered no details about what exactly the two women are accused of doing.

A Knox County Criminal Court clerk said the indictments against Hunter and Underwood were not on file Wednesday afternoon. Sheriff's office spokeswoman Hillary Martin referred questions to the Knox County District Attorney General's Office. A spokesman for that office didn't immediately return a request for comment.

Official oppression is a fairly broad charge under Tennessee law. It is essentially defined as when a public servant uses his or her position to intentionally mistreat another person while knowing it's against the law. The charge is a Class E felony.

A grand jury returned the indictments after an investigation by KCSO's Family Crisis Unit, which probes cases involving child abuse as well as domestic violence, elder abuse, animal abuse and cyber crime.

More information will be updated when it becomes available.

Reach Travis Dorman at travis.dorman@knoxnews.com or on Twitter @travdorman.